Earthquakes – Day 3 10/13/10

Objectives Today I will be able to: – Analyze the ________ of seismic stations necessary to locate an earthquake __________ – Describe other natural ________ __________of earthquakes – Analyze how earthquake waves provide ______________about earth’s ____________ – Describe earthquake _____________________

Locating Earthquakes- Part II Using earthquake waves to locate an epicenter ESSENTIAL QUESTION WHILE YOU’RE WATCHING… HOW MANY SEISMIC STATIONS WOULD YOU NEED TO ACCURATELY LOCATE AN EARTHQUAKE EPICENTER? _____________

Other useful information from earthquake waves Earthquake waves tell us the _________of an earthquake’s ____________and ___________ Earthquake waves also tell us about the make up of the ______________________ – This information is available because _______and __________ travel at different ___________and are able to pass through ___________________________________ BOTTOM LINE: most of the information we know about the ____________ was obtained by studying _______________________.

Effects of Earthquakes Main effect of earthquakes… A lot of ____________________ Side effects: – _______________ -“seismic sea waves” triggered by earthquakes occurring underwater ________waves caused by ______________________ – Landslides- ground movement and ____________ – Fires- ____________________and electrical wires

Effects of Earthquakes San Francisco Earthquake 1989 Look at how widespread the effects of the Earthquake are!

Effects of Earthquakes Where did you see the earthquake affecting people? At some of these locations and other locations in the area, people were seriously injured… At other location people were alright. Watch this next clip to figure out why Destruction in California Earthquake

Earthquake Safety Structures that withstood the shaking… – Candlestick park Built on ____________________________ Structures that did not withstand the shaking… – Bay Bridge- too ______and ___________________ – Freeway in Oakland- _______flexible or reinforced – Landfill Soft land Buildings _________and collapsed, water and gas lines broke

Earthquake Safety Buildings can sink!? – The process is known as _____________________ – Let’s see how it works – Liquefaction Liquefaction Bottom line: The __________location during a major earthquake would be an area with __________________… and if possible a location that has been ___________________

Check In – Answer on a separate piece of paper in complete sentences: 1.Most of the information about Earth’s interior was obtained by studying what? 2.What is the minimum number of seismic stations needed to determine the location of an earthquake? 3.Describe the type of building that would be safest during an earthquake. 4.How would the lives of people living in areas affected by tsunamis be effected if earthquakes stopped happening?

Recent Earthquakes Listen as I describe and we watch footage from recent earthquakes in Haiti and Chile. Both suffered devastating Earthquakes this year, while you watch thing of things they have in common and things that are different about them. – n_haiti.html n_haiti.html – n_chile.html n_chile.html

Venn Diagram 1.On a half sheet of paper, create a Venn Diagram comparing the earthquakes. – 4 things only about haiti – 4 things only about chile – 4 things in common 2.WRITE A PARAGRAPH (5-8 sentences long) describing the earthquakes and their destruction using key terms from yesterday and today IN YOUR OWN WORDS on the back of the diagram.